HW2

How to get started with Problem 3

Questions

Go over code from quiz question 4

Scrabble bingo

data: words in the dictionary and letters on tiles

go through each word in the dictionary, check if it can be made with the tiles

annoying to have a separate variable for each letter, impossible to have one for each word

need to way to group a bunch of related data together!

Python gives us the list

think of it as a slot in memory with its own numbered slots inside

NUMBERING STARTS AT ZERO!

tiles = ["D", "O", "B", "Y", "E", "G", "O"]

print(tiles[0])

D

print(tiles[6])

O

print(tiles[7])

IndexError

print(tiles[-2])

G

lists can be modified

tiles[2] = "L"
print(tiles) # prints ["D", "O", "L", "Y", "E", "G", "O"]

We still need a way to avoid a separate line of code for each possible word

Examine our sequence of copy-pasted code—what changes each time?

We need a structure that repeats the same thing over-and-over, except changing one thing each time: for loop

for <loop variable> in <sequence>:
    <indented loop body>

for word in words:
    # check if tiles can make word

quick check: given a variable nums that stores a list, write a for loop that prints out each element of the list

for num in nums:
print(num)

import sys
words = ["bogeyed", "goodbyes", "goodbye", "phantasmagorical"]
tiles = ["D", "O", "B", "Y", "E", "G", "O"]

for word in words:
    check = tiles.copy()
    for letter in word: 
        if letter in check:
            check.remove(letter)
    if len(check) == 0 and len(word) == len(tiles):
        print("The Scrabble tiles", tiles, "can be played as a bingo:", word)
        sys.exit()

print("The Scrabble tiles", tiles, "cannot be played as a bingo")

strings are sequences just like lists, so we can loop over each letter with for letter in word

use the in keyword to get True or False for a value being present in a sequence

len is a function that takes a sequence and returns the number of elements in that sequence